Method of forming castings on disposable cores



L. H. MORIN July 15, 1947.

METHOD OF-FORMING CASTINGS ON DISPOS'ABLE CORES -Filed Dec. 14, 1942 2. 6 6 9 J 5 9 Z 3 1% 1 a n T L." QMQWBLK x u l w x n w J 2 INVENTOR I laws/7070mm ATTOR Y JJ ,5; 66 J5 Patented July 15, 1947 METHOD OF FORMING CASTINGS ON DISPOSABLE CORES Louis H. Morin, Bronx, N. Y., assignor of one-half to Davis Marinsky, Bronx, N. Y

Application December 14, 1942, Serial No. 469,018

1 Claim.

This invention relates to the method of forming successive individual die castings. More particularly, the invention relates to the method of forming such castings on paper-board, plastic, or similar disposable cores, and in utilizing the cores in giving predetermined shape or contour to the resulting castings, and still further in using the cores for spacing one casting from another casting formed in interlocked relationship to each other.

The novel features of the invention will be best understood from the following description when taken together with the accompanying drawing, in which certain embodiments of the invention are disclosed, and in which the separate parts are designated by suitable reference characters in each of the views, and in which:

Fig. 1 is a diagrammatic view taken along the I parting line of a pair of dies indicating the method of forming pairs of castings on a pair of disposable cores.

Fig. 2 is a section on the line 2-2 of Fig. 1.

In the formation of die castings, it has been a common practice where cores are required to use metallic cores of various kind, on which the casting is formed, and reference here is primarily made to cores arranged on the parting line of relatively movable dies, then after the casting is formed, the same is stripped from the core.

This method of procedure has necessarily restricted the cores to types and kinds which are readily removable from the resulting castings in the stripping operation, thus making it impossible to form undercuts by the use of such cores. Still further, when these cores have been used as means for spacing two castings one from the other, they have been further objectionable from the standpoint of the difiiculty in removing or stripping the castings from the cores, particularly when fairly large castings are formed.

With my present invention, I employ a method of forming series of castings on what I term a disposable core, and by this I mean a core which can be easily removed from the castings. The method, which I have herein diagrammatically illustrated insofar as the general operation is concerned is more clearly disclosed in my co-pending application Serial Number 448,816, filed June 27, 1942, which has since issued as Patent No. 2,363,801, dated November 28, 1944, the structure of the present dies diifering from those disclosed in the patent above identified, being due to the difference in core members employed.

In the different uses and adaptations of my I invention, the cores employed may be composed of any type and kind of readily disposable material, such for example, as paper, cardboard, inexpensive plastic materials and the like, and this applies to all of the later described adaptations of the invention.

At this time, attention is also directed to the fact that the invention is applicable to the formation of any type and kind of die castings where metal alloys or plastic materials are employed.

With the construction as disclosed in Figs. 1 and 2, the cores may be used as means for feeding the casting and for spacing the core for the reception of successive castings, and in other instances, other cores may be employed to control the feed of the castings, particularly when such other cores are desirable to assist in ejection of the castings from the dies.

In Figs. 1 and 2 of the drawing I have shown an adaptation of the invention where two core strips 50 and 5| are employed and arranged side by side between relatively movable dies 52 and 53, note Fig. 2. In this construction, the cores 50, 5| are employed to form part of the cavity of the dies and as means spacing one casting from a previously formed casting and also for separating two simultaneously formed castings. Still further, the two cores 50, 5! serve as means supporting the several interlocked or intercoupled castings in a definite spaced relationship to each other until such time as the strips are removed.

With the dies 52, 53 disclosed in Figs. 1 and 2, the impression surfaces 54, and 55, note Fig. 2, in conjunction with the strips 50, 5| are adapted to form two interlocked links 56, and 51 in pressure injecting casting material through the gate opening 58 in forming a gate 59 on a feed pin 60, employed to move the dual castings 56 and 5! from the casting position to the position indicated by the previously cast pair of links 56, 51

shown at the lower portion of Fig. 1.

The dies 52 and 53 also have impressions for receiving the lower links 56, 51, as well as to receive the gate 59. In forming the second casting, the link 51 is cast within the link 56 of the first casting as indicated at 6!, in Fig. 1 of the drawing.

As successive pairs of castings 56, 51 are formed, they are fed from the dies along with the cores 5B, 5|, and these core strips together with the gates 59 may be removed whenever desired.

From a consideration of the drawing, it will be apparent that the core strip or strips may be utilized to separate overlapped as well as interlocked cast members one from the other. In this sense, the strips may be defined as spacing members and also as forming members.

In the present diagrammatic illustration of the invention, the disposable core is illustrated in the form of a continuous strip which is desirable in forming castings to beheld in a definite spaced relationship, and where the strip may be used as a means for feeding the castings to a suitable machine.

It will be apparent, however, that the shape, structure and size of the disposable core may be made to suit particular casting employed, and in some instances, in casting small members or devices, it will be desirable to use independent cores for each member or device.

Having fully described my invention, what I claim as new and desire to secure by Letters Patent is:

The method of forming pairs of independent interfitting die castings, which comprises supporting a pair of paper core members within spaced parts only of the cavities of relatively movable dies, with both pairs of core members extending outwardly beyond the limits of the die cavities, arranging the core members to separate said cavities to form independent castings, pressure injecting casting material into the cavities of the dies, when in lClOSGd position, around the parts of the core members supported therein to form a pair of castings arranged on and supported by both of said core members and joined only by a common gate, then shifting the first pair of castings including the core members and gate to position a new section of the core members between the cavities of said die, then forming the next successive pair of castings with one casting thereof interfitting with one casting of the first pair, and [then removing the gates from the pairs of castings and disposing of the core members in forming of the successive pairs of castings a series of interfitting relatively movable castings.

LOUIS H. MORIN.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1,648,149 Reeve Nov. 8, 1927 2,171,006 Morgan et al Aug. 29, 1939 1,161,194 Cook NOV. 23, 1915 2,102,328 Morin et a1 Dec. 14, 1937 2,200,633 Morin et a1. May 14, 1940 2,263,340 Kraemer Nov. 18, 1941 1,784,780 Bronson Dec. 9, 1930 1,983,558 .Morin et al. Dec. 11, 1934 2,017,216 Marcus Oct. 15, 1935 2,348,935 Smith May 16, 1944 1,993,212 Edwardes Mar. 5, 1935 2,053,371 Lee Sept. 8, 1936 2,363,801 Morin Nov. 28, 1944 

